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**Chemical formula:** UO₂ **Hardness:** 5‒6 **Density:** 10.6 g/cm³ **Crystal system:** Cubic (Isometric) **Luster:** Greasy **Description:** Uraninite is the primary ore of uranium and radium. Historically, it was used in color production and as a source of radium for therapeutic treatments. Today, uraninite is critical for nuclear power, serving as fuel in nuclear reactors, as well as in military applications for nuclear warheads and depleted uranium ammunition. It also has applications in medicine, biology, metallurgy and other fields. ## Keywords mineral uraninite texture color ornamental stone semi-precious gemstone
